We had gotten some old accordian doors from a VFW that were wood ( probably 40-50 years old in a smoking building) that we used in part for the 2... 8ft closet door openings in my quilt rm. And the smoke smell was BAD, we used freebreeze a number of times on the wood, bothsides and smell is good, didn't hurt the wood. We did clean them first with Murphy soap to get any residue off from the cig smoke. Good luck!